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Mercurial (d38398e5144e)

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BooleanFlag

nsINode

nsMutationGuard

nsSlots

Macros

Line Code
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsINode_h___
#define nsINode_h___

#include "mozilla/Likely.h"
#include "mozilla/UniquePtr.h"
#include "nsCOMPtr.h"               // for member, local
#include "nsGkAtoms.h"              // for nsGkAtoms::baseURIProperty
#include "nsIDOMNode.h"
#include "mozilla/dom/NodeInfo.h"            // member (in nsCOMPtr)
#include "nsIVariant.h"             // for use in GetUserData()
#include "nsNodeInfoManager.h"      // for use in NodePrincipal()
#include "nsPropertyTable.h"        // for typedefs
#include "nsTObserverArray.h"       // for member
#include "mozilla/ErrorResult.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/EventTarget.h" // for base class
#include "js/TypeDecls.h"     // for Handle, Value, JSObject, JSContext
#include "mozilla/dom/DOMString.h"
#include "mozilla/dom/BindingDeclarations.h"
#include <iosfwd>

// Including 'windows.h' will #define GetClassInfo to something else.
#ifdef XP_WIN
#ifdef GetClassInfo
#undef GetClassInfo
#endif
#endif

class nsAttrAndChildArray;
class nsChildContentList;
struct nsCSSSelectorList;
class nsDOMAttributeMap;
class nsIAnimationObserver;
class nsIContent;
class nsIDocument;
class nsIDOMElement;
class nsIDOMNodeList;
class nsIEditor;
class nsIFrame;
class nsIMutationObserver;
class nsINode;
class nsINodeList;
class nsIPresShell;
class nsIPrincipal;
class nsIURI;
class nsNodeSupportsWeakRefTearoff;
class nsNodeWeakReference;
class nsDOMMutationObserver;

namespace mozilla {
class EventListenerManager;
namespace dom {
/**
 * @return true if aChar is what the DOM spec defines as 'space character'.
 * http://dom.spec.whatwg.org/#space-character
 */
inline bool IsSpaceCharacter(char16_t aChar) {
  return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' ||
         aChar == '\f';
}
inline bool IsSpaceCharacter(char aChar) {
  return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' ||
         aChar == '\f';
}
class AccessibleNode;
struct BoxQuadOptions;
struct ConvertCoordinateOptions;
class DOMPoint;
class DOMQuad;
class DOMRectReadOnly;
class Element;
class EventHandlerNonNull;
template<typename T> class Optional;
class OwningNodeOrString;
template<typename> class Sequence;
class Text;
class TextOrElementOrDocument;
struct DOMPointInit;
struct GetRootNodeOptions;
enum class CallerType : uint32_t;
} // namespace dom
} // namespace mozilla

#define NODE_FLAG_BIT(n_) \
  (nsWrapperCache::FlagsType(1U) << (WRAPPER_CACHE_FLAGS_BITS_USED + (n_)))

enum {
  // This bit will be set if the node has a listener manager.
  NODE_HAS_LISTENERMANAGER =              NODE_FLAG_BIT(0),

  // Whether this node has had any properties set on it
  NODE_HAS_PROPERTIES =                   NODE_FLAG_BIT(1),

  // Whether this node is the root of an anonymous subtree.  Note that this
  // need not be a native anonymous subtree.  Any anonymous subtree, including
  // XBL-generated ones, will do.  This flag is set-once: once a node has it,
  // it must not be removed.
  // NOTE: Should only be used on nsIContent nodes
  NODE_IS_ANONYMOUS_ROOT =                NODE_FLAG_BIT(2),

  // Whether the node has some ancestor, possibly itself, that is native
  // anonymous.  This includes ancestors crossing XBL scopes, in cases when an
  // XBL binding is attached to an element which has a native anonymous
  // ancestor.  This flag is set-once: once a node has it, it must not be
  // removed.
  // NOTE: Should only be used on nsIContent nodes
  NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE =          NODE_FLAG_BIT(3),

  // Whether this node is the root of a native anonymous (from the perspective
  // of its parent) subtree.  This flag is set-once: once a node has it, it
  // must not be removed.
  // NOTE: Should only be used on nsIContent nodes
  NODE_IS_NATIVE_ANONYMOUS_ROOT =         NODE_FLAG_BIT(4),

  // Forces the XBL code to treat this node as if it were
  // in the document and therefore should get bindings attached.
  NODE_FORCE_XBL_BINDINGS =               NODE_FLAG_BIT(5),

  // Whether a binding manager may have a pointer to this
  NODE_MAY_BE_IN_BINDING_MNGR =           NODE_FLAG_BIT(6),

  NODE_IS_EDITABLE =                      NODE_FLAG_BIT(7),

  // This node was created by layout as native anonymous content. This
  // generally corresponds to things created by nsIAnonymousContentCreator,
  // though there are exceptions (svg:use content does not have this flag
  // set, and any non-nsIAnonymousContentCreator callers of
  // SetIsNativeAnonymousRoot also get this flag).
  //
  // One very important aspect here is that this node is not transitive over
  // the subtree (if you want that, use NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE).
  // If Gecko code somewhere attaches children to a node with this bit set,
  // the children will not have the bit themselves unless the calling code sets
  // it explicitly. This means that XBL content bound to NAC doesn't get this
  // bit, nor do nodes inserted by editor.
  //
  // For now, this bit exists primarily to control style inheritance behavior,
  // since the nodes for which we set it are often used to implement pseudo-
  // elements, which need to inherit style from a script-visible element.
  //
  // A more general principle for this bit might be this: If the node is entirely
  // a detail of layout, is not script-observable in any way, and other engines
  // might accomplish the same task with a nodeless layout frame, then the node
  // should have this bit set.
  NODE_IS_NATIVE_ANONYMOUS =              NODE_FLAG_BIT(8),

  // Whether the node participates in a shadow tree.
  NODE_IS_IN_SHADOW_TREE =                NODE_FLAG_BIT(9),

  // Node has an :empty or :-moz-only-whitespace selector
  NODE_HAS_EMPTY_SELECTOR =               NODE_FLAG_BIT(10),

  // A child of the node has a selector such that any insertion,
  // removal, or appending of children requires restyling the parent.
  NODE_HAS_SLOW_SELECTOR =                NODE_FLAG_BIT(11),

  // A child of the node has a :first-child, :-moz-first-node,
  // :only-child, :last-child or :-moz-last-node selector.
  NODE_HAS_EDGE_CHILD_SELECTOR =          NODE_FLAG_BIT(12),

  // A child of the node has a selector such that any insertion or
  // removal of children requires restyling later siblings of that
  // element.  Additionally (in this manner it is stronger than
  // NODE_HAS_SLOW_SELECTOR), if a child's style changes due to any
  // other content tree changes (e.g., the child changes to or from
  // matching :empty due to a grandchild insertion or removal), the
  // child's later siblings must also be restyled.
  NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS = NODE_FLAG_BIT(13),

  NODE_ALL_SELECTOR_FLAGS =               NODE_HAS_EMPTY_SELECTOR |
                                          NODE_HAS_SLOW_SELECTOR |
                                          NODE_HAS_EDGE_CHILD_SELECTOR |
                                          NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS,

  // This node needs to go through frame construction to get a frame (or
  // undisplayed entry).
  NODE_NEEDS_FRAME =                      NODE_FLAG_BIT(14),

  // At least one descendant in the flattened tree has NODE_NEEDS_FRAME set.
  // This should be set on every node on the flattened tree path between the
  // node(s) with NODE_NEEDS_FRAME and the root content.
  NODE_DESCENDANTS_NEED_FRAMES =          NODE_FLAG_BIT(15),

  // Set if the node has the accesskey attribute set.
  NODE_HAS_ACCESSKEY =                    NODE_FLAG_BIT(16),

  // Set if the node has right-to-left directionality
  NODE_HAS_DIRECTION_RTL =                NODE_FLAG_BIT(17),

  // Set if the node has left-to-right directionality
  NODE_HAS_DIRECTION_LTR =                NODE_FLAG_BIT(18),

  NODE_ALL_DIRECTION_FLAGS =              NODE_HAS_DIRECTION_LTR |
                                          NODE_HAS_DIRECTION_RTL,

  NODE_CHROME_ONLY_ACCESS =               NODE_FLAG_BIT(19),

  NODE_IS_ROOT_OF_CHROME_ONLY_ACCESS =    NODE_FLAG_BIT(20),

  // These two bits are shared by Gecko's and Servo's restyle systems for
  // different purposes. They should not be accessed directly, and access to
  // them should be properly guarded by asserts.
  //
  // FIXME(bholley): These should move to Element, and we only need one now.
  NODE_SHARED_RESTYLE_BIT_1 =             NODE_FLAG_BIT(21),
  NODE_SHARED_RESTYLE_BIT_2 =             NODE_FLAG_BIT(22),

  // Whether this node has dirty descendants for Servo's style system.
  NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO =  NODE_SHARED_RESTYLE_BIT_1,

  // Remaining bits are node type specific.
  NODE_TYPE_SPECIFIC_BITS_OFFSET =        23
};

// Make sure we have space for our bits
#define ASSERT_NODE_FLAGS_SPACE(n) \
  static_assert(WRAPPER_CACHE_FLAGS_BITS_USED + (n) <=                          \
                  sizeof(nsWrapperCache::FlagsType) * 8,                        \
                "Not enough space for our bits")
ASSERT_NODE_FLAGS_SPACE(NODE_TYPE_SPECIFIC_BITS_OFFSET);

/**
 * Class used to detect unexpected mutations. To use the class create an
 * nsMutationGuard on the stack before unexpected mutations could occur.
 * You can then at any time call Mutated to check if any unexpected mutations
 * have occurred.
 */
class nsMutationGuard {
public:
  nsMutationGuard()
  {
    mStartingGeneration = sGeneration;
  }

  /**
   * Returns true if any unexpected mutations have occurred. You can pass in
   * an 8-bit ignore count to ignore a number of expected mutations.
   *
   * We don't need to care about overflow because subtraction of uint64_t's is
   * finding the difference between two elements of the group Z < 2^64.  Once
   * we know the difference between two elements we only need to check that is
   * less than the given number of mutations to know less than that many
   * mutations occured.  Assuming constant 1ns mutations it would take 584
   * years for sGeneration to fully wrap around so we can ignore a guard living
   * through a full wrap around.
   */
  bool Mutated(uint8_t aIgnoreCount)
  {
    return (sGeneration - mStartingGeneration) > aIgnoreCount;
  }

  // This function should be called whenever a mutation that we want to keep
  // track of happen. For now this is only done when children are added or
  // removed, but we might do it for attribute changes too in the future.
  static void DidMutate()
  {
    sGeneration++;
  }

private:
  // This is the value sGeneration had when the guard was constructed.
  uint64_t mStartingGeneration;

  // This value is incremented on every mutation, for the life of the process.
  static uint64_t sGeneration;
};

// This should be used for any nsINode sub-class that has fields of its own
// that it needs to measure;  any sub-class that doesn't use it will inherit
// SizeOfExcludingThis from its super-class.  SizeOfIncludingThis() need not be
// defined, it is inherited from nsINode.
// This macro isn't actually specific to nodes, and bug 956400 will move it into MFBT.
#define NS_DECL_SIZEOF_EXCLUDING_THIS \
  virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const override;

// Categories of node properties
// 0 is global.
#define DOM_USER_DATA         1
#define SMIL_MAPPED_ATTR_ANIMVAL 2

// IID for the nsINode interface
#define NS_INODE_IID \
{ 0x70ba4547, 0x7699, 0x44fc, \
  { 0xb3, 0x20, 0x52, 0xdb, 0xe3, 0xd1, 0xf9, 0x0a } }

/**
 * An internal interface that abstracts some DOMNode-related parts that both
 * nsIContent and nsIDocument share.  An instance of this interface has a list
 * of nsIContent children and provides access to them.
 */
class nsINode : public mozilla::dom::EventTarget
{
public:
  typedef mozilla::dom::BoxQuadOptions BoxQuadOptions;
  typedef mozilla::dom::ConvertCoordinateOptions ConvertCoordinateOptions;
  typedef mozilla::dom::DOMPoint DOMPoint;
  typedef mozilla::dom::DOMPointInit DOMPointInit;
  typedef mozilla::dom::DOMQuad DOMQuad;
  typedef mozilla::dom::DOMRectReadOnly DOMRectReadOnly;
  typedef mozilla::dom::OwningNodeOrString OwningNodeOrString;
  typedef mozilla::dom::TextOrElementOrDocument TextOrElementOrDocument;
  typedef mozilla::dom::CallerType CallerType;
  typedef mozilla::ErrorResult ErrorResult;

  template<class T>
  using Sequence = mozilla::dom::Sequence<T>;

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODE_IID)

  // Among the sub-classes that inherit (directly or indirectly) from nsINode,
  // measurement of the following members may be added later if DMD finds it is
  // worthwhile:
  // - nsGenericHTMLElement:  mForm, mFieldSet
  // - nsGenericHTMLFrameElement: mFrameLoader (bug 672539)
  // - HTMLBodyElement:       mContentStyleRule
  // - HTMLDataListElement:   mOptions
  // - HTMLFieldSetElement:   mElements, mDependentElements, mFirstLegend
  // - HTMLFormElement:       many!
  // - HTMLFrameSetElement:   mRowSpecs, mColSpecs
  // - HTMLInputElement:      mInputData, mFiles, mFileList, mStaticDocfileList
  // - nsHTMLMapElement:      mAreas
  // - HTMLMediaElement:      many!
  // - nsHTMLOutputElement:   mDefaultValue, mTokenList
  // - nsHTMLRowElement:      mCells
  // - nsHTMLSelectElement:   mOptions, mRestoreState
  // - nsHTMLTableElement:    mTBodies, mRows, mTableInheritedAttributes
  // - nsHTMLTableSectionElement: mRows
  // - nsHTMLTextAreaElement: mControllers, mState
  //
  // The following members don't need to be measured:
  // - nsIContent: mPrimaryFrame, because it's non-owning and measured elsewhere
  //
  virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;

  // SizeOfIncludingThis doesn't need to be overridden by sub-classes because
  // sub-classes of nsINode are guaranteed to be laid out in memory in such a
  // way that |this| points to the start of the allocated object, even in
  // methods of nsINode's sub-classes, and so |aMallocSizeOf(this)| is always
  // safe to call no matter which object it was invoked on.
  virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
  }

  friend class nsNodeUtils;
  friend class nsNodeWeakReference;
  friend class nsNodeSupportsWeakRefTearoff;
  friend class nsAttrAndChildArray;

#ifdef MOZILLA_INTERNAL_API
  explicit nsINode(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
  : mNodeInfo(aNodeInfo)
  , mParent(nullptr)
  , mBoolFlags(0)
  , mNextSibling(nullptr)
  , mPreviousSibling(nullptr)
  , mFirstChild(nullptr)
  , mSubtreeRoot(this)
  , mSlots(nullptr)
  {
  }
#endif

  virtual ~nsINode();

  /**
   * Bit-flags to pass (or'ed together) to IsNodeOfType()
   */
  enum {
    /** nsIContent nodes */
    eCONTENT             = 1 << 0,
    /** nsIDocument nodes */
    eDOCUMENT            = 1 << 1,
    /** nsIAttribute nodes */
    eATTRIBUTE           = 1 << 2,
    /** text nodes */
    eTEXT                = 1 << 3,
    /** xml processing instructions */
    ePROCESSING_INSTRUCTION = 1 << 4,
    /** comment nodes */
    eCOMMENT             = 1 << 5,
    /** form control elements */
    eHTML_FORM_CONTROL   = 1 << 6,
    /** document fragments */
    eDOCUMENT_FRAGMENT   = 1 << 7,
    /** data nodes (comments, PIs, text). Nodes of this type always
     returns a non-null value for nsIContent::GetText() */
    eDATA_NODE           = 1 << 8,
    /** HTMLMediaElement */
    eMEDIA               = 1 << 9,
    /** animation elements */
    eANIMATION           = 1 << 10,
    /** filter elements that implement SVGFilterPrimitiveStandardAttributes */
    eFILTER              = 1 << 11
  };

  /**
   * API for doing a quick check if a content is of a given
   * type, such as Text, Document, Comment ...  Use this when you can instead of
   * checking the tag.
   *
   * @param aFlags what types you want to test for (see above)
   * @return whether the content matches ALL flags passed in
   */
  virtual bool IsNodeOfType(uint32_t aFlags) const = 0;

  virtual JSObject* WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;

  /**
   * returns true if we are in priviliged code or
   * layout.css.getBoxQuads.enabled == true.
   */
  static bool HasBoxQuadsSupport(JSContext* aCx, JSObject* /* unused */);

protected:
  /**
   * WrapNode is called from WrapObject to actually wrap this node, WrapObject
   * does some additional checks and fix-up that's common to all nodes. WrapNode
   * should just call the DOM binding's Wrap function.
   *
   * aGivenProto is the prototype to use (or null if the default one should be
   * used) and should just be passed directly on to the DOM binding's Wrap
   * function.
   */
  virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) = 0;

public:
  mozilla::dom::ParentObject GetParentObject() const; // Implemented in nsIDocument.h

  /**
   * Return the scope chain parent for this node, for use in things
   * like event handler compilation.  Returning null means to use the
   * global object as the scope chain parent.
   */
  virtual nsINode* GetScopeChainParent() const;

  /**
   * Return whether the node is an Element node
   */
  bool IsElement() const {
    return GetBoolFlag(NodeIsElement);
  }

  /**
   * Return this node as an Element.  Should only be used for nodes
   * for which IsElement() is true.  This is defined inline in Element.h.
   */
  mozilla::dom::Element* AsElement();
  const mozilla::dom::Element* AsElement() const;

  /**
   * Return this node as nsIContent.  Should only be used for nodes for which
   * IsContent() is true.  This is defined inline in nsIContent.h.
   */
  nsIContent* AsContent();
  const nsIContent* AsContent() const
  {
    return const_cast<nsINode*>(this)->AsContent();
  }

  /**
   * Return this node as Text if it is one, otherwise null.  This is defined
   * inline in Text.h.
   */
  mozilla::dom::Text* GetAsText();
  const mozilla::dom::Text* GetAsText() const;

  virtual nsIDOMNode* AsDOMNode() = 0;

  /**
   * Return if this node has any children.
   */
  bool HasChildren() const { return !!mFirstChild; }

  /**
   * Get the number of children
   * @return the number of children
   */
  virtual uint32_t GetChildCount() const = 0;

  /**
   * Get a child by index
   * @param aIndex the index of the child to get
   * @return the child, or null if index out of bounds
   */
  virtual nsIContent* GetChildAt(uint32_t aIndex) const = 0;

  /**
   * Get a raw pointer to the child array.  This should only be used if you
   * plan to walk a bunch of the kids, promise to make sure that nothing ever
   * mutates (no attribute changes, not DOM tree changes, no script execution,
   * NOTHING), and will never ever peform an out-of-bounds access here.  This
   * method may return null if there are no children, or it may return a
   * garbage pointer.  In all cases the out param will be set to the number of
   * children.
   */
  virtual nsIContent * const * GetChildArray(uint32_t* aChildCount) const = 0;

  /**
   * Get the index of a child within this content
   * @param aPossibleChild the child to get the index of.
   * @return the index of the child, or -1 if not a child
   *
   * If the return value is not -1, then calling GetChildAt() with that value
   * will return aPossibleChild.
   */
  virtual int32_t IndexOf(const nsINode* aPossibleChild) const = 0;

  /**
   * Returns the "node document" of this node.
   *
   * https://dom.spec.whatwg.org/#concept-node-document
   *
   * Note that in the case that this node is a document node this method
   * will return |this|.  That is different to the Node.ownerDocument DOM
   * attribute (implemented by nsINode::GetOwnerDocument) which is specified to
   * be null in that case:
   *
   * https://dom.spec.whatwg.org/#dom-node-ownerdocument
   *
   * For all other cases OwnerDoc and GetOwnerDocument behave identically.
   */
  nsIDocument *OwnerDoc() const
  {
    return mNodeInfo->GetDocument();
  }

  /**
   * Return the "owner document" of this node as an nsINode*.  Implemented
   * in nsIDocument.h.
   */
  nsINode *OwnerDocAsNode() const;

  /**
   * Returns true if the content has an ancestor that is a document.
   *
   * @return whether this content is in a document tree
   */
  bool IsInUncomposedDoc() const
  {
    return GetBoolFlag(IsInDocument);
  }

  /**
   * Get the document that this content is currently in, if any. This will be
   * null if the content has no ancestor that is a document.
   *
   * @return the current document
   */

  nsIDocument* GetUncomposedDoc() const
  {
    return IsInUncomposedDoc() ? OwnerDoc() : nullptr;
  }

  /**
   * This method returns the owner doc if the node is in the
   * composed document (as defined in the Shadow DOM spec), otherwise
   * it returns null.
   */
  nsIDocument* GetComposedDoc() const
  {
    return IsInShadowTree() ?
      GetComposedDocInternal() : GetUncomposedDoc();
  }

  /**
   * Returns true if GetComposedDoc() would return a non-null value.
   */
  bool IsInComposedDoc() const
  {
    return IsInUncomposedDoc() || (IsInShadowTree() && GetComposedDocInternal());
  }

  /**
   * The values returned by this function are the ones defined for
   * nsIDOMNode.nodeType
   */
  uint16_t NodeType() const
  {
    return mNodeInfo->NodeType();
  }
  const nsString& NodeName() const
  {
    return mNodeInfo->NodeName();
  }
  const nsString& LocalName() const
  {
    return mNodeInfo->LocalName();
  }

  /**
   * Get the NodeInfo for this element
   * @return the nodes node info
   */
  inline mozilla::dom::NodeInfo* NodeInfo() const
  {
    return mNodeInfo;
  }

  inline bool IsInNamespace(int32_t aNamespace) const
  {
    return mNodeInfo->NamespaceID() == aNamespace;
  }

  /**
   * Print a debugger friendly descriptor of this element. This will describe
   * the position of this element in the document.
   */
  friend std::ostream& operator<<(std::ostream& aStream, const nsINode& aNode);

protected:
  // These 2 methods are useful for the recursive templates IsHTMLElement,
  // IsSVGElement, etc.
  inline bool IsNodeInternal() const
  {
    return false;
  }

  template<typename First, typename... Args>
  inline bool IsNodeInternal(First aFirst, Args... aArgs) const
  {
    return mNodeInfo->Equals(aFirst) || IsNodeInternal(aArgs...);
  }

public:
  inline bool IsHTMLElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_XHTML);
  }

  inline bool IsHTMLElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_XHTML);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfHTMLElements(First aFirst, Args... aArgs) const
  {
    return IsHTMLElement() && IsNodeInternal(aFirst, aArgs...);
  }

  inline bool IsSVGElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_SVG);
  }

  inline bool IsSVGElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_SVG);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfSVGElements(First aFirst, Args... aArgs) const
  {
    return IsSVGElement() && IsNodeInternal(aFirst, aArgs...);
  }

  inline bool IsXULElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_XUL);
  }

  inline bool IsXULElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_XUL);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfXULElements(First aFirst, Args... aArgs) const
  {
    return IsXULElement() && IsNodeInternal(aFirst, aArgs...);
  }

  inline bool IsMathMLElement() const
  {
    return IsElement() && IsInNamespace(kNameSpaceID_MathML);
  }

  inline bool IsMathMLElement(nsIAtom* aTag) const
  {
    return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_MathML);
  }

  template<typename First, typename... Args>
  inline bool IsAnyOfMathMLElements(First aFirst, Args... aArgs) const
  {
    return IsMathMLElement() && IsNodeInternal(aFirst, aArgs...);
  }

  /**
   * Insert a content node at a particular index.  This method handles calling
   * BindToTree on the child appropriately.
   *
   * @param aKid the content to insert
   * @param aIndex the index it is being inserted at (the index it will have
   *        after it is inserted)
   * @param aNotify whether to notify the document (current document for
   *        nsIContent, and |this| for nsIDocument) that the insert has
   *        occurred
   *
   * @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
   * than one element node as a child of a document.  Doing this will also
   * assert -- you shouldn't be doing it!  Check with
   * nsIDocument::GetRootElement() first if you're not sure.  Apart from this
   * one constraint, this doesn't do any checking on whether aKid is a valid
   * child of |this|.
   *
   * @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
   */
  virtual nsresult InsertChildAt(nsIContent* aKid, uint32_t aIndex,
                                 bool aNotify) = 0;

  /**
   * Append a content node to the end of the child list.  This method handles
   * calling BindToTree on the child appropriately.
   *
   * @param aKid the content to append
   * @param aNotify whether to notify the document (current document for
   *        nsIContent, and |this| for nsIDocument) that the append has
   *        occurred
   *
   * @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
   * than one element node as a child of a document.  Doing this will also
   * assert -- you shouldn't be doing it!  Check with
   * nsIDocument::GetRootElement() first if you're not sure.  Apart from this
   * one constraint, this doesn't do any checking on whether aKid is a valid
   * child of |this|.
   *
   * @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
   */
  nsresult AppendChildTo(nsIContent* aKid, bool aNotify)
  {
    return InsertChildAt(aKid, GetChildCount(), aNotify);
  }

  /**
   * Remove a child from this node.  This method handles calling UnbindFromTree
   * on the child appropriately.
   *
   * @param aIndex the index of the child to remove
   * @param aNotify whether to notify the document (current document for
   *        nsIContent, and |this| for nsIDocument) that the remove has
   *        occurred
   *
   * Note: If there is no child at aIndex, this method will simply do nothing.
   */
  virtual void RemoveChildAt(uint32_t aIndex, bool aNotify) = 0;

  /**
   * Get a property associated with this node.
   *
   * @param aPropertyName  name of property to get.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* GetProperty(nsIAtom *aPropertyName,
                    nsresult *aStatus = nullptr) const
  {
    return GetProperty(0, aPropertyName, aStatus);
  }

  /**
   * Get a property associated with this node.
   *
   * @param aCategory      category of property to get.
   * @param aPropertyName  name of property to get.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* GetProperty(uint16_t aCategory, nsIAtom *aPropertyName,
                    nsresult *aStatus = nullptr) const;

  /**
   * Set a property to be associated with this node. This will overwrite an
   * existing value if one exists. The existing value is destroyed using the
   * destructor function given when that value was set.
   *
   * @param aPropertyName  name of property to set.
   * @param aValue         new value of property.
   * @param aDtor          destructor function to be used when this property
   *                       is destroyed.
   * @param aTransfer      if true the property will not be deleted when the
   *                       ownerDocument of the node changes, if false it
   *                       will be deleted.
   *
   * @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
   *                                       was already set
   * @throws NS_ERROR_OUT_OF_MEMORY if that occurs
   */
  nsresult SetProperty(nsIAtom *aPropertyName, void *aValue,
                       NSPropertyDtorFunc aDtor = nullptr,
                       bool aTransfer = false)
  {
    return SetProperty(0, aPropertyName, aValue, aDtor, aTransfer);
  }

  /**
   * Set a property to be associated with this node. This will overwrite an
   * existing value if one exists. The existing value is destroyed using the
   * destructor function given when that value was set.
   *
   * @param aCategory       category of property to set.
   * @param aPropertyName   name of property to set.
   * @param aValue          new value of property.
   * @param aDtor           destructor function to be used when this property
   *                        is destroyed.
   * @param aTransfer       if true the property will not be deleted when the
   *                        ownerDocument of the node changes, if false it
   *                        will be deleted.
   * @param aOldValue [out] previous value of property.
   *
   * @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
   *                                       was already set
   * @throws NS_ERROR_OUT_OF_MEMORY if that occurs
   */
  nsresult SetProperty(uint16_t aCategory,
                       nsIAtom *aPropertyName, void *aValue,
                       NSPropertyDtorFunc aDtor = nullptr,
                       bool aTransfer = false,
                       void **aOldValue = nullptr);

  /**
   * A generic destructor for property values allocated with new.
   */
  template<class T>
  static void DeleteProperty(void *, nsIAtom *, void *aPropertyValue, void *)
  {
    delete static_cast<T *>(aPropertyValue);
  }

  /**
   * Destroys a property associated with this node. The value is destroyed
   * using the destruction function given when that value was set.
   *
   * @param aPropertyName  name of property to destroy.
   */
  void DeleteProperty(nsIAtom *aPropertyName)
  {
    DeleteProperty(0, aPropertyName);
  }

  /**
   * Destroys a property associated with this node. The value is destroyed
   * using the destruction function given when that value was set.
   *
   * @param aCategory      category of property to destroy.
   * @param aPropertyName  name of property to destroy.
   */
  void DeleteProperty(uint16_t aCategory, nsIAtom *aPropertyName);

  /**
   * Unset a property associated with this node. The value will not be
   * destroyed but rather returned. It is the caller's responsibility to
   * destroy the value after that point.
   *
   * @param aPropertyName  name of property to unset.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* UnsetProperty(nsIAtom  *aPropertyName,
                      nsresult *aStatus = nullptr)
  {
    return UnsetProperty(0, aPropertyName, aStatus);
  }

  /**
   * Unset a property associated with this node. The value will not be
   * destroyed but rather returned. It is the caller's responsibility to
   * destroy the value after that point.
   *
   * @param aCategory      category of property to unset.
   * @param aPropertyName  name of property to unset.
   * @param aStatus        out parameter for storing resulting status.
   *                       Set to NS_PROPTABLE_PROP_NOT_THERE if the property
   *                       is not set.
   * @return               the property. Null if the property is not set
   *                       (though a null return value does not imply the
   *                       property was not set, i.e. it can be set to null).
   */
  void* UnsetProperty(uint16_t aCategory, nsIAtom *aPropertyName,
                      nsresult *aStatus = nullptr);

  bool HasProperties() const
  {
    return HasFlag(NODE_HAS_PROPERTIES);
  }

  /**
   * Return the principal of this node.  This is guaranteed to never be a null
   * pointer.
   */
  nsIPrincipal* NodePrincipal() const {
    return mNodeInfo->NodeInfoManager()->DocumentPrincipal();
  }

  /**
   * Get the parent nsIContent for this node.
   * @return the parent, or null if no parent or the parent is not an nsIContent
   */
  nsIContent* GetParent() const {
    return MOZ_LIKELY(GetBoolFlag(ParentIsContent)) ?
      reinterpret_cast<nsIContent*>(mParent) : nullptr;
  }

  /**
   * Get the parent nsINode for this node. This can be either an nsIContent,
   * an nsIDocument or an nsIAttribute.
   * @return the parent node
   */
  nsINode* GetParentNode() const
  {
    return mParent;
  }

  /**
   * Returns the node that is the parent of this node in the flattened
   * tree. This differs from the normal parent if the node is filtered
   * into an insertion point, or if the node is a direct child of a
   * shadow root.
   *
   * @return the flattened tree parent
   */
  inline nsINode* GetFlattenedTreeParentNode() const;

  /**
   * Like GetFlattenedTreeParentNode, but returns null for any native
   * anonymous content that was generated for ancestor frames of the
   * root element's primary frame, such as scrollbar elements created
   * by the root scroll frame.
   */
  inline nsINode* GetFlattenedTreeParentNodeForStyle() const;

  /**
   * Get the parent nsINode for this node if it is an Element.
   * @return the parent node
   */
  mozilla::dom::Element* GetParentElement() const
  {
    return mParent && mParent->IsElement() ? mParent->AsElement() : nullptr;
  }

  /**
   * Get the parent Element of this node, traversing over a ShadowRoot
   * to its host if necessary.
   */
  mozilla::dom::Element* GetParentElementCrossingShadowRoot() const;

  /**
   * Get the root of the subtree this node belongs to.  This never returns
   * null.  It may return 'this' (e.g. for document nodes, and nodes that
   * are the roots of disconnected subtrees).
   */
  nsINode* SubtreeRoot() const;

  /*
   * Get context object's shadow-including root if options's composed is true,
   * and context object's root otherwise.
   */
  nsINode* GetRootNode(const mozilla::dom::GetRootNodeOptions& aOptions);

  /**
   * See nsIDOMEventTarget
   */
  NS_DECL_NSIDOMEVENTTARGET

  virtual mozilla::EventListenerManager*
    GetExistingListenerManager() const override;
  virtual mozilla::EventListenerManager*
    GetOrCreateListenerManager() override;

  using mozilla::dom::